Motherboards come in various sizes, from small and compact mini-ITX boards, to unfathomably complex and larger boards like E-ATX and EE-ATX. Although the standard ATX motherboard is considered the most common and popular due to its mid-size and versatile layout, its younger sibling, the Micro-ATX motherboard (also known as m-ATX) is a form factor that is ideal for users who like compact builds but don't want to sacrifice much on features and internal headers.